For those who are interested in more complete and precise information on this topic, you might want to check out this doctoral dissertation (http://www.people.fas.harvard.edu/~phuybers/Doc/thesis.pdf) that discusses many of these periodicities and how they affect incoming solar radiation (insolation). It was completed in 2004 and the author was a grad student at MIT. I have to confess that I have only skimmed it, but it looks to be well-researched and well-written.
Andy
-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu [mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of JPreisig at aol.com
Sent: Monday, September 23, 2013 1:23 PM
To: radsafe at health.phys.iit.edu
Subject: Re: [ RadSafe ] Arctic Ice
Radsafe:
Of course. In terms of Earth orientation (with respect to the Sun)
1998 was a polar motion amplitude high (strongly dipping towards the Sun),
while 2020 will be like 1976 (rather low polar motion amplitude). I've
asked Chopo Ma (NASA Goddard) to plot the polar motion amplitude with respect
to time and/or Arctic/Antarctic Sea Ice percentage, and we'll see if such a
data plot will show up one day soon. A good data plot (with good fitting)
should give some resolution to this question NOW.
The VLBI earth orientation data are available from NASA Goddard's Very
Long Baseline Interferometry website, and someone else at NASA has the
Arctic/Antarctic ice percentage data. Someone with a few weeks available (at
Sandia, Los Alamos or elsewhere) could do the World a service by doing this
calculation. Good books on Earth Orientation are Munk and MacDonald,
Lambeck I and Lambeck II (Space Geodesy). This stuff isn't simple though. Get
Cranking???
Joe Preisig
In a message dated 9/23/2013 10:05:28 A.M. Eastern Daylight Time,
mmiller at sandia.gov writes:
Worth noting, of course. However, one data point does not a trend make.
Stay tuned for a decade or two.
-----Original Message-----
From: JPreisig at aol.com [mailto:JPreisig at aol.com]
Sent: Saturday, September 21, 2013 10:32 AM
To: radsafe at health.phys.iit.edu
Subject: [ RadSafe ] Fwd: Arctic Ice
____________________________________
From: JPreisig at aol.com
To: dickman at binghamton.edu
Sent: 9/21/2013 12:30:01 P.M. Eastern Daylight Time
Subj: Arctic Ice
Dr. Dickman/Steve:
News item today on Google News.
Sea ice in the Arctic Ocean underwent a sharp recovery this year from the
record-low levels of 2012, with 50 percent more ice surviving the
summer melt season, scientists said Friday.
Will this trend continue???
Thus endeth Global Warming????
Joe Preisig
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